Severe Thrombocytopenia in a Patient With a History of Olfactory Neuroblastoma.

Olfactory neuroblastoma is a rare disease with no randomized clinical trials to guide treatment decision making. Surgery, radiation, and chemotherapy are all used for treatment, and prognosis is mostly determined by the histologic grade and clinical stage. While a neuroendocrine type of neoplasm is similar to small cell carcinoma, metastatic disease in olfactory neuroblastoma is rare. We present a case at our institution of an uncommon clinical course of relapsed olfactory neuroblastoma complicated by severe thrombocytopenia.